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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e1232938cefa91085aa2c1c447bdfbe979bfb090aa6c29e8e58844b1e46eac' 
  AND token = 'w6hakZUL5/xM6aOs/EvyCzfZW8oF79KjeLPR/qRut8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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