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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b84230a67b69bf3d84cfb31c221f2e57ac95309abde23dc97707f4f0d5686d' 
  AND token = 'EIMZY7spvAr/usAIhHlbV6wnA7RIV2Ams+pOkqAqy7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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