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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0200910fd154a0c9de5e03c7bdf3517821e57dfc9cf10e95a0b7402517a457b' 
  AND token = '9MxGDaJJLgVdkdRuSUTMHFiisXe4B8aGGexi7dj/XS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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