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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96bc0237dd78d37624ff2767b59b9224047833835ec88546a9caa47fdf36dcf' 
  AND token = 'z/3BxKp7n8tNSJV124AwHCXEuu6+LR7Qw1FEzIE1e+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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