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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e19dd2d8bdc2ad2e4f9efae979f9cc647ace2bb1a9abbad3b8d17a22a85763' 
  AND token = 'wxo9bJbXzAnaF7pAhEQ5IlvH5vlw4zFcNzDBUoaRt+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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