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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58dc6cdb5bd3683cbd0389f007c3233ba4bda1416d1ecf27b5a77f1dfa5816af' 
  AND token = 'fVDaV7JCziiV7d0e3qW+8j2XnSqUtWWRtDmjMsfuEBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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