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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dd5f458c492709df6be39a36754c741ea7c313f5a64e6a089b0ae2710cd207' 
  AND token = 'xscdZnzhgk3GadF+iHL7wNQqwTy3Q1ak+6H2C9q7lQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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