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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34629e3800531ea1bd9af3eb1a5397de32456863b1e17983ea1c708ffe8c59c1' 
  AND token = 'i/oIdnwTtSYY4kSVAjPdLou9kDamhe9cssTYXRs34gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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