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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b42725e0e1971a4903e550541b350e777ac0948f0ed90643ef556d28bc2a82e' 
  AND token = 'Z/n8AnXNuwhkX0J7RPftKRdCvpC0/ieNv+60d/ZcYWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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