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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5d2a2fc059c1b957b89406da73b64d508487080a717a24bb5890fb4bd4a568' 
  AND token = 'LtBMPstzHL+56J+5etAz2rdLjjecXVfWfR1IaM6Flp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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