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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2a7880a7d7e0ffcfbc6d7d62cf71448cde1df80d26e5961fc1c990ae21d5c8' 
  AND token = '96QYSn4l2fSGxviQDQ/NFofz82hmuJjy/OjqylU87uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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