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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e734c1191b4a0ecb90ecdb019cd4c7408b0390c2e891c8cccfdc42c752656019' 
  AND token = 'b3n3KTxnI28WX01HHygETjsrjfNBJnNdYsMhYQKlxxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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