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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ffbc8cdd0f8d9072e77862ab5d4de2f40d7d6a65934e2fe8ebdf7a5f398e0f' 
  AND token = 'g2AzemUfmD+oJ/ZDA4vIAW0chputXEjujIgolDPg5s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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