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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc07db51649aff63f932c51687bc8cd8714db03c908005f0988b11c30417b8b3' 
  AND token = 'btJtwBm4nuNZTZzkfJOvecJL4XcGnhELMxnI40C2dZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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