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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87abedaf8a74842ff6eca8d09c4e23fc31bb5ad8fe3224e1b2904cfd0b2e6f51' 
  AND token = '55pfQIFWpCRagWReO06Xp7EKvhoiHphnh56edbKznkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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