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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa75eba8f0561ef84ea4d3f354162e6c0f540c9fea0536a2f7a78d0b17a23e7' 
  AND token = 'E5IG/PX2cxyWSXugM/kNsyWzn9TlupBKnwWlNLsT5rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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