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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28646de6d202cd4d2f865b40c24d2bb394b499c031ebf594ea6cafced8bdf056' 
  AND token = 'PmIfqB5fS6kTfmgYz++pnV31xjhUHDgMM7jD93X653I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}