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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23ac946fec430f0c76e42b1bd483e239daa8256a3607bc45e119094ff1e1abe' 
  AND token = '5SRk1oblzeuyCn99qTh26dSnn6v/372cx5nLd2CUVss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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