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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fe051bae8076c2531f77ca3ade91c92fdd9099d0a19c8b3f9b8c568ad3896a' 
  AND token = 'KNlwippZHBMu8BPpdeRXfv43vZj19BkHwozEbRpPv5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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