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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5997c16d78926f114d8efbfcd9d37885436b0b1cd166a952bef048e418d5cfe3' 
  AND token = 'FOSw63brlaJxStn3Vy1ha4r7pVXYd4mc1gTK0A93Ru8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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