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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05ef48f51dd36e7124fc7ad5fca66931bb4b71e0ccd77bd06c9a1053dbe750e' 
  AND token = 'bzm94i4bcma5Caqr8XxdBhWFnAbpuI370jrLk6jdnjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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