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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fcb6fca29a0f436a50fe66a7f2f0bb1b12a1b92d0b59707ee33bfec7b50b5f9' 
  AND token = 'N/7MimASdUL2/h3NO2fzLP6gZXzDPmZU5Ncq5PhOH18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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