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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed231c9aad094ee600b46164a8871032a2ee33d88f6e12846db3dbc5a028e95' 
  AND token = 'ESXY8yy+WTxRe0BFPGlM8eN8J/Ck3+mGutR/zEXuMnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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