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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84507792f4f7b0b29e54000dbd99fa83094f2832def2768b95498aee5cbdcb63' 
  AND token = 'Ry80JpQvs5DIJ35pqbVJLpeoz430Voxgcsbvkq4sMWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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