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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b719f74d8a50528d07960023cd79500d95bd384b7c095fd97cea6a2633e73e1' 
  AND token = 'JsuOynK7ir8BN9A9MmXWYg9z+Fb3wa1pvoDz73wC7ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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