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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6e4a06b86fdc0be6971cd6aebb0848f82f9bed17031a834619e4bb1519bc76' 
  AND token = 'ZR2bn30sB5JbMK2667IS8iyuuF3svtekVMSTLwvjLDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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