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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2387be5bd42ecf5e58e8226984cb87050321705df93faa97616758083309e1d' 
  AND token = '5hncV1pNGwQYaN81TE4LrT2kuQ4mn/kC65T3RAYwgM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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