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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f824eb1f8c676e876e7e1f6abbd7f0fc95dbd0b18081ee59c2e01f94a7967f' 
  AND token = '1e8H1u8HVJGTy2BVRAuvHoRQGk30qI2dIplzStwXr88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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