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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029cb4b220de5c6bf2627561c90c5af4b77682dfe966361fc120cdc24889d0fb' 
  AND token = 'CtEnVNvjOtgNzkPsssJ1uIShuZE9lEe7IyyScMYMltg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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