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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5267711d751d84bd9921257bd2c30e403db8b45ac3b9830d2c071c111a3c01' 
  AND token = 'vkMsBeT/FO4mcZGDrrGX2gckLruce0sktiYRTkXnN/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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