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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e538b0485878667064435e70bdca63951b9c0ef7ce8d63976b978b189f2ff8d' 
  AND token = 'djS4OWKm2HDovyzam8K1s7gONVnTwHwsJWTLdoY4+AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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