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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcad637539ba3d1569147c8ba7e96c373a6b64b64fe214157b08daaa4c1c114' 
  AND token = 'KiMG24O0YBT7Hksa/bRnLlVSqHSr4NHFtlyHrNifplk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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