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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126a6e59d59d3a2f7da4b44b187d6bcfa0e19bf1498ba53f77c8eec73db58d0e' 
  AND token = 'UTSE7fXr2O/9vpUq03z7WKqGYN0I3jW7jZKtR/szdCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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