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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b39e636fe47f4438dfe93b8ac1c06d06815925d32aabd5babc1323e9bc9b929' 
  AND token = 'dq/amE3SaaY34N8e40euJox09YRMx0A/TvCksUU7jlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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