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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1387f408c0f18ebba77331768486a04fa95fe4ca85b4e0cc19c67238c5c547f4' 
  AND token = 'uQyPXVp8z/ORvj7/DJ+xwRSEm5EX3p3tz1uJn0sGw3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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