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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c289db173b4e5919559d3c2e7ffe7abaa20dedf123b28cb85d9339d4835bdc' 
  AND token = '8+/oHTHFlK1PUBiahxTKCV59Rudtkp9cdP9rKR9QtBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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