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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a86b11a59564cfffc522723282dbe2e447dedfbb63e85e85f8c0f6b9b14f33f' 
  AND token = '2BEQ6snQwJEPK4xCRr1Nu/FP1smVvSn80qliM37YbWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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