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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7736ed7a0ac145db4fc45b21b803e8e7bfafd2c08911e8e8065f7a9a87d102c0' 
  AND token = 'otPwI63Df0x4OGY5C8xNyydY/oYj+zSqzExxQV24xM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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