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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7174dc0e0e5b944969ea249740d1422113b9af2920197acdfb30e66a14bb2b2e' 
  AND token = 'HbBRZcAvH4vsNVcRej1ghXKY2L+ReeM8LBVpWw1fYFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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