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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4033d107e4c18358d119f26dcb10e1c62eecef68ffb541e8ed904b356ab011' 
  AND token = 'te9zxZWMyMTvTFyrXlfgn1m5r8S8PIozSc1Jho93D5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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