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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd2bb195048c53b2930add6be99d1ee84f7e569c1c47909188ed12a81b22e83' 
  AND token = '/HvdIZcOs6Hh32OPEp+f7s/19D5BN1kpiWtbMUEXsZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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