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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2af7af9731a6a2324271c018abfc354784114b44348cec96fdccb07479a6b54' 
  AND token = 'ed9TMxxWxyiT5hj3AbDI1Da5bJwAlWKNu6cEJlxIdV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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