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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4926767a1eebb7fbefb4fed2bc32f3e609f30696edd1386984677b96b384bc6' 
  AND token = 'HE/C7/MOd99/M5lQJElrwKIePMI0virWMF2AuXhiZ2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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