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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868592dc6ed2074e0122cb0eacfaa5380a26b0d5bac62bd1203df1319a42cca5' 
  AND token = 'RWpEAvIH0pqJZCqefO7nyQ+eisXZr8UbN9uQprLJIWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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