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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3313b38d4e934bb155f8dea8bc5467a269bee0be0b88fd818d5496b1a2a023e' 
  AND token = 'SCgRno40Pi3KwdRGqwTPqT0l2XwqziCnwchFtRBfUXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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