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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '100013cd83b68ed46dc62c8c39ead968fef0162d1101b590b4d50efc0dd3b936' 
  AND token = 'Le0ZQ8B7f0z1ijDQbofshye7M+1rBJGM4dsen84Bwxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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