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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a47455e429895a7ff8182268abfe8a1610bce6d5d12ea4b4bd0c46394c47dde' 
  AND token = 'zK1JNxbTM8KTYPCds+VScPDcFU2TijMIyn1CrKcYNhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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