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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '046e8dcdab5d0ea4087b8b4a09b5594c1e414197d7db1e5bd8b7dbb52e936afd' 
  AND token = 'f8+JJZW4exNNBRtPcmvulkARGLBPYMuDk8mLvoBeGaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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