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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd23272afe0be62624bba1e89c234af9ec2584ac7d88a2e40895c02b8697726d' 
  AND token = 'd/P6WrHuwpqXQLdy3To3C8Ij2PkqkZ+t15rRJ/b20fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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