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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c459aab3b468877e649f03ce1c25b5a45be66a73e6217dfd0af107b154018d60' 
  AND token = 'Hg5gYGSnrp/qr6Vj3sgObpMCljPDf57/bK2Vx0datDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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