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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8526d485df7d12289bdd8f1441bcc27f39c5ad3a951649991cad85beb49638' 
  AND token = '8WGC9OzJT0peg/5sOJ417c8tTN1EPbbGcciRmPskKDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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