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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86448290fe4d0a9d14e7fc3b4583c9f57a0b974f0997adf1ae9aa5b84bd98a2b' 
  AND token = 'kTrr6DH3ew2UL3FjmK705IoPMn+GbyJKhYINDqIz2No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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